/// <summary>
        /// Sharpen algorithm. Here we create a new window from where we implement the algorithm.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void sharpen_Click(object sender, RoutedEventArgs e) {
            if (m_data.M_inputFilename == string.Empty || m_data.M_bitmap == null) {
                MessageBox.Show("Open image first!", "ArgumentsNull", MessageBoxButton.OK, MessageBoxImage.Error);
                return;
            }

            try {
                Sharpen sharpenWindow = new Sharpen(m_data, m_vm);
                sharpenWindow.Owner = this;
                sharpenWindow.Show();
            } catch (FileNotFoundException ex) {
                MessageBox.Show(ex.Message, "FileNotFoundException", MessageBoxButton.OK, MessageBoxImage.Error);
            } catch (ArgumentException ex) {
                MessageBox.Show(ex.Message, "ArgumentException", MessageBoxButton.OK, MessageBoxImage.Error);
            } catch (InvalidOperationException ex) {
                MessageBox.Show(ex.Message, "InvalidOperationException", MessageBoxButton.OK, MessageBoxImage.Error);
            } catch (IndexOutOfRangeException ex) {
                MessageBox.Show(ex.Message, "IndexOutOfRangeException", MessageBoxButton.OK, MessageBoxImage.Error);
            } catch (Exception ex) {
                MessageBox.Show(ex.Message, "Exception", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }